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Inventories (Tables)
9 Months Ended
Sep. 28, 2012
Inventories Tables [Abstract]  
Components of Inventories
   Sep 28, Dec 30,
   2012 2011
        
 Finished products and components$ 58,020 $ 51,943
 Products and components in various     
  stages of completion  42,659   39,268
 Raw materials and purchased components  60,482   54,561
     161,161   145,772
 Reduction to LIFO cost  (40,575)   (40,425)
 Total$ 120,586 $ 105,347